Usually the manager doesn't care about this though - a p-number is a p-number, it doesn't matter if they are paying them $200k or $100k (assuming the salary range for the position was that large).
If anything the manager would prefer a higher offer that the candidate is likely to expect than a low-ball which they reject and then the hiring process has to continue.
Yup. I never had any incentive to haggle over the Salary. If I got them to agree to a lowball, no one ever rewarded me, or cared.